My dear Sir

It would be ungracious on my part not to thank you for your letter which I can do with sincerity.² With time my impression may pass away, & I hope so; but impressions slowly gained & continually strengthened do not readily pass away from the mind in old age.— To aid in the good work I will keep to my resolution & not read your answer to M^r Wright—³ The impression which I have taken can hardly be quite fanciful   Agassiz has uttered splendid sarcasms on me, but I still feel quite friendly towards him:⁴ Ld Flourens c^d. not find words to express his contempt of me:⁵ Pictet & Hopkins argued with great force against me: Fleeming Jenkins covered me with first-rate ridicule; & his criticisms were true & most useful: but none of their writings have mortified me as yours have done—.⁶

Besides having been acquainted with you, & thinking that we had a mutual friendly feeling, I think it is the sense of unfairness on your side, which mortifies me. For instance, when you detailed all my changes of opinion & errors (I maintain that the former are very far indeed from being as great as you state),⁷ if you had wished to be fair, you w^d. have allowed that the subject was an intricate one—that nearly all the best naturalists in Europe had written on it & criticised my book—that I had in strongest language (at close of Introduction of Origin in all editions) declared that much remained un-explained. Under these circumstances it w^d. prove me a fool not to have changed to a certain extent   If I had said that I c^d. explain everything you might have written as you have done.— But it is folly on my part to have written at this length.— You will hardly be able to read or understand this note, & pray do not answer it.— I should be glad to think that I have been foolish & unjust towards you.—

Yours sincerely, | C. Darwin

P.S. If you will look at the last words of Introduction of Origin of 1^st & all subsequent editions, you will see how expressly I say that I do not attribute the modification of species exclusively to Natural Selection: & I do not think I c^d have chosen a more conspicuous place.—⁸

I will send you a copy of new Edit. of Origin, soon to be published & now all printed, & I hope there is not a word personally offensive to you or any other man in it— I have had it stereotyped, so that I cannot, thank God, answer any more criticisms.—⁹ Pray do not write when you receive it; for our minds are so fundamentally different that what appears to me (& at least to some others,) sound reasoning will be to you frivolous.

C.D.